Jack



JACK

Filed June 18, 1926 L 9 r 9 2 0 WW 7 2 MM Patented Dec. 9, 1936 warren;sraras JOHN M. oANrwnLL, or 'rARRYrowN, NEW YORK :racx

Application filed June '18,

This inventionrelates to screw lifting jacks particularly adapted formotor vehicles, the object of the invention being to provide an,improved jack of this class, simple in con- 1* struction, strong,durable, powerful in use, and easily operated. i

Another object of the invention is the provision of an improved combinedliftin jack and rim tool which may be used, not on ly for 10 the removalof the shoes from the rims, but for materially increasing the height Iof-the jack when necessary.

The particular object of the present invention is'the-provision of animproved'screw 15 acli which can be readily and inexpensivelymanufactured andso constructed that it can be readily used for-a -verylow lift or easily extended for a high or extra high lift, asinay benecessary. s i

In the drawings accompanying andformiing a part of thisspecificatiomFigure 1 isa vertical sectional view of this improved screwjack, illustrating thetire irons in position for use as an extension ofthe jack, one of the rim members being shown connected with the baseplate of the jack; Fig. 2 is a partly sectional view illustratingthescrews of the.

jack extended and also illustrating one-of the rim members in place onthe base; Fig. 3 39 is a cross-sectional view, taken in line 33 ofFig. 1. Y

Similar characters of reference indicate corresponding parts in theseveral figures of the drawings. v

Before explaining in detail the present improvement and mode ofoperation thereof, I desire to have it understood that the invention isnot limited to the details of construction and arrangement of partswhich areillustrated in the accompanying drawings,

since the invention is capable of other embodiments, and that thephraseol-ogy which I employ is for the purpose of description and oflimitation. s

This improved jack in its preferred form comprises a suitable casing 2flanged at its lower end as at .3, to which is attached by screws a baseplate 4. This casing comprises M a cylindrical portion 5'having anenlarged chamber 6 and having at its upper end an 1926. Serial m.116,780.

inwardly extending flange 7. Located in this casing is a rotatabletubular sleeve 8, the I upper end of which isyoverlapped by the flange?of the casing while the lower end rests upon the base plat.e 4c, thuspreventing lengthwise movement of the sleeve 8.- The sleeve 8 isprovided with a large bevel gear 9 shown formed as a part thereof, and.in mesh with this bevel gear is a small bevel gear 10 carried by asuitable bracket or support 11 attached to aremovable plate 10.

- This removable plate is by suitable screws attached to an inclinedportion of the casing and affords access ,to the casing and the properpositioning of the bevel gear 10. The bevelgear 10' is provided with asquare ended spindle 12 for'th'e reception of a crank or handle by meansof which it may be rotated thereby to rotate the bevelgear 9' and thetubular sleeve 8.

Within the rotary tubular sleeve Sis a pair of telescopic screws 13 and14, both of the same length, the screw 13 being in the form of. atubular member having exteriorthreads 15 along its length meshing with"a threaded portion or collar 16 carried atthe upper'end of the tubularsleeve 8. This tubular screw 13 is also. provided at its upper end withan interiorly threaded portion or collar 17 meshing with threads 18located along the length .of the screw 14, which is shown as a solidba'r;

The tubular screw:13 is provided 'exteriorly with a'longitud'inal slotor key way 19 for the reception of a spring pressed tooth :or plungerkey 20' carriedat the upper end of the casing, and which may be insertedor removed through an opening closed by a suitable threaded plug 21.These screws 13 and 14 are completely housed within the casing 2, whichcan be comparatively low, thus enabling the jack to have a very-low liftand yet be extended to give a very high lift. The tubular screw member13 has its threads smoothed or slabbed off at its upper end as at '22and also smoothed orslabbed off at its lower end as at 23 and with whichthe longitudinal slot 19 communicates. The screw member 1 1 is providedwitha suitable pin for limiting the upward movement thereof, this pincoming into engagement with the thread ed portion 17 of the tubularscrew member and the tubular screw member is likewise provided with asuitable pin at its lower end which, when it comes into engagement withthe threads of the sleeve 8, will limit its upward movement. The top ofthe screw member letis squared for the reception of a supporting head24, which is pinned thereto and this head is slotted at its ends as at25, the slots terminating in circular receses for the receptionofthestirrup bars 25" of a pair of tire irons 26. These tire irons can,

by means of the slotted'circular recesses 25",

be swung up or down and can also be-removed due to the fact that thestirrup bars are flattened. In other words, theseflattened portionscorrespond inf-thickness substantially to the slotted portions of therecesses while at right angles to the flattened portions they correspondsubstantially to the circular porr tions thereof. One of the irons isprovided with a step 27 of tapered form and this'step projects into anopening 29 in the other iron when the irons are swung into a verticalposition, the step serving as a. means of wedging the two together tohold the irons in such position. The step is provided with an open ing28for the receptionof a cotter pin. This holding or looking step 27 mayalso be used as a step of the jack when desired, both irons in this casebeinglof course swung downward, thus providing a stepcbelow' the top ofthe screws in any position of those screws, so that whenthe screwsaretelescopedthe step i will be very close to the ground or road bed thusproviding a means for engagingthe axle or under frame of a car in theevent that the wheels are sunk inithe mud or sand or in otheremergencies where there is but small space between the roadbed and theframe or axle of the car. The tops of the irons have suitable extensions32 adapting them to be used as rim tools while the opposite parts 32 canbe used as steps of the jack when the irons are in the position shown inFig; 1. When the irons are to be used as a rim tool, a bifurcated platemay be slipped over the base plate in the manner shown in Figs. 1 and 2,this plate being provided with a tongue or projection 31 somewhatsimilar to those, as

V 32. formed at the tops of the tire irons.

In the operation of this improved jack, the rotation of the small bevelgear 10 rotates the b vel gear 9 and the sleeve 8 which isof course heldagains longtudinal movement by the base plate and flange 7. The rotationof this sleeve around the tubular screw 13 forces it upward,'therotation of the screw 13 being prevented by the tooth 20 passing'alongthe longitudinal slot 19 of the screw 13. This upward movement of thetubular outer screw 13 carries with it the innerscrew 14 without howeverrotating or extending it. When, however, the screw 13 has reached itsextended position the tooth 21 passes out of the slot 19 and registerswith the lower slabbed portion 23 of the screw 13 and in consequence thescrew 13 will then be rotated by the tubular sleeve 8,

parts 32 in position to engage the axle or under frame of the car, asshown in Fig. 1

to increasefurther the height of the jack. A reverse operation firstlowers the screw 13 as soon as-the' rotation thereof brings the slot. 19opposite the tooth 20, until it has been fully lowered. When theslab-bed off portion 22 comes. opposite the tooth 20, the tubulerscrew13 will then be rotated again by thesleeve 8', thereupon'to rotate theinner screw 14 and lower it in a manner which will readily' beunderstood. In spreading the shoe rim, it is necessary merely to use theupper. tire iron and not the lower ones, sincethe base of'thev jiack maybe used against the rim. In contracting-the rim, however, thelower. tireiron 30 would be used. c

From the foregoing, it will be observed that ifeach' screw aboveitsoverlapping part is eight inches in height, a lifting jack is "providedhaving a total lift of 16 inches without the use oft-he: tire irons,while with the use of the tire irons the height of the jackis'materially increased, according to the length of the tire irons, thusproviding a jack which is useful "for many purposes and particularlyuseful for motor vehicles where the underframe or axles are low hung orclose to the ground.

Furthermore, it will be observed that both screws are of the same lengthand yet are no greater inlength than the casing.

It will be further observed that the bevel gear 9 is formed as apart ofthe sleeve 8 so that the sleeve and the bevel gear can be onecastingwith thesleeve at its center resting directly on the base plate 4without the necessity of providing any ball races, since the sleeve 8has a tapered lower end provided with a hardened steel rivet or knob 10so that the frictional resistance is very slight. Should there be anytendency of lateral. movement at the lower end of the sleeve 8, the baseplate i can be provided with a depression for the knob or river 10 tofit into, similar to that shown in my 00- pending application, SerialNo. 171,498, filed February 28, 1927, although it is believed thatthefrictional engagement of the rivet '10 with the base 4 when load isupon the jack, together with the fact that there is considerable bearingsurface between the upper end of thesleeve 8 and the casing 5 issufiicient to prevent any such lateral movement. "Further, as thethreads 16 and 17 are formed as parts of the screws 13 and 14respectively, this eliminates the necessity of providing separate pinnedcollars likely, to

be displaced, and by slabbing off the threads of the screw 13 as at 22and 23 the necessity of specially fori'ning a separate annular groove isavoided, while the provision of a spring pressed tooth which can beeasily removed and replaced when worn is permitted.

' These improved features together with others and the improved form oftire irons very much simplify the construction, de-

creasing the cost of manufacture and ren-' d-ering the ash more easilyoperated, so that the same forms an improved jack over that shown anddescribed in my Patent No. 1,540,511, dated June 2, 1925; i i

It is to be understood that by describing in detail herein anyparticular form, structure or arrangement, it is not intended to limitthe invention beyond the terms of the several claims or the requirementsof the prior art.

Having thus explained the nature of my said invention and described away of constructing and using the same, although with outatteinptingtoset forth all of the forms in which it may be made, or, allof'the modes of ts use, I claim:

1. In a screw lifting ack, the combination of a supporting casing, apair of telescopic lifting screws within said casing, the outertelescopic screw having slabbed portions at its top and bottomcommunicating.

with a longitudinal key way, and-a spring pressed plunger carriedvat theupper end of the casing and cooperating at different times with saidslabbed portions and key way, and means for lifting one of said screwswithout rotating it and for then rotating it thereby to lift the otherscrew and including a rotatable tubular sleeve also housed entirelywithin and extending substantially from end to end of said casing, andmechanism connected adjacent to the lower end of said sleeve forrotating said sleeve.

2. In a screw lifting jack, the combination of a supporting casing, apair of telescopic lifting screws, one comprising a tubular exteriorlythreaded member having integral interior threads at its upper end, aspring pressed plunger for preventing the rotation of said threadedtubule r member at one time,

' said member having slabbed portions at its top and bottom and alongitudinal key way communicating therewith for cooperation. with saidspring pressed plunger, means for lifting one of said screws withoutrotating it and for then rotating it thereby to liftthe other screw andincluding a rotatable tubular sleeve housed entirely within andextending substantially from end to end of said casing and havingintegral interiorly located threads at its upper end and an integralbevel 3. In a lifting jack, the combination of a pair of telescopicinner and outer screws operatively connected, a threaded sleeveembracing said outer screw for operating the same, a supporting casinghousing said sleeve en tirely within the same, said sleeve extendingsubstantially from end to'end of the casing, and aspring pressed plungercarried at the upperend of'said casing, said outer screw having avertical keyway for receiving said plunger and terminating ina pair ofslabbed portions at its upper and lower ends to permit the plunger topass around the threads adjacent to said slabbed portions.

l. In a lifting jaclgthe combination of a pair of telescopic inner andouter screws oper a spring pressed plunger carried at the upper end ofsaid casing,- said outer, screw having a vertical keyway for receivingsaid plunger and terminating in a pair of slabbed portions at its upperand lower ends to p'ermitthe plunger topass around the threads adjacentto said-slabbed portions, said threaded sleeve also having a bevel gearand said gear and sleeve being formed as a single casting.

5. In a lifting jack, the combination of a supporting casing, a pair oftelescopic lifting screws, means for lifting one of said screws withoutrotating it and for then rotatit to lift the other screw and including avertically extending rotatable sleeve embracing one of said screws andhousing entirely within and extending substantially from end to end ofthe casing, gear means connected to said sleeve for rotating the same, aspring pressed plunger located at the upper end of the casing, and meanscooperating therewith and comprising a vertical slot carried by theouter telescopic screw and a pair of slabbed portions at theends of saidslot for permitting iri sequence sliding and rotating movements of theouter screw.

6. In a screw lifting jack, the combination of a casing, a rotatablesleeve located entirely within and extending substantially from end toend of saidicasing and having a bevel gear and a threaded portion at itsupper end a tubular exteriorly threaded screw cooperatingwith thethreaded portion of said sleeve and having an 'interiorly threadedportion at its upper end, a telescopic screw within said threaded screw,said outer screw vhaving akey way and a pair of slabbed portions at theof said outer sleeve theouter screw will be extended without rotationthereof and will then be rotated to rotate theinner screw.

7. In a lifting jack, the Combination of supporting means, a liftingmember, means for operating the same, said member having a head, a pairoftire irons swingingly carried thereby, one of said irons having anopening and the other a jack-lifting step projecting thereinto. V 1

-8. In a lifting jack, the combination of supportingmeans, a'liftingmember, means for operating the same, said member having a head, apairof tire irons swmgingly'car ried thereby, one of said irons having anopening and the other a ack-lifting step projecting thereinto, saidjack-lifting step havi-ng a wedge formation.

9. In a lifting jack,rthe combination of a casing, a'pair of telescopicinner and outer screws located therein and operatively connected, meansfor operating the same successively, and a spring pressed plungercarried at the upper end of said casing, said outer screw havinga'vertical key way for of the outer screw at one time and preventing itsrotation at another and comprising a key way and slabbed portionscarried by the outer screw at the ends of said key way, and a springpressed plunger carried at the upper end of the casing.

-11. In a lifting jack the combination of supporting means, a liftingmember, means for operating the same, said member having a head, a pairof tire irons swingingly carried by said head and adapted to be swung upordown, one of said irons having a step projecting therefrom in positionfor use belowithe top of the jack in any position of the lifting memberand said irons having means for connecting them when swung into positionto operate as an extension of the jack.

12. Ina lifting jack the combination of supporting means, a pair oftelescopic screws carried thereby, means for operating the same, a headcarried by one of said screws, a.

pair of tire irons swingingly carried by said head-and'adapted to beswung up or down, one of saidtire irons having a step projectingtherefrom in position for use below the top of the jack in any positionof the screws.

13. In a lifting jack ,the combination of: supporting means, a pair oftelescopic screws carried thereby, means for operating thesame, aheadcarried by one of said screws, a pair of tire irons swingingly carriedby said head and adapted to be swung up or down, one of said tire ironshaving a step projecting therefrom in position for use below the top ofthe jack in any position of the screws and the other iron having anopening for the reception of said step when the irons are swung upward.

14. A tire iron for use with a jack having a hook-shaped rim engagingend, an integral stirrup formed opposite end, and a jack steptherebetween. i

15. A pair of tireirons for use with a jack each having a hook-shapedrim engaging end and astirrup formed opposite end, one of said ironshaving a jack step and the other an opening for the reception of suchstep.

16. A jack comprising a base, lifting means carried thereby, means foroperating it, and tire removing means comprising, a member adapted toengage the base of the jack and provided with means for engaging the rimof a tire, and swinging means carried by the lifting means and providedwith means for also engaging the rim of a tire and with a jack stepbetween the ends thereof, and means carriedby said swinging members forconnecting them when swung into position to operate as an extension ofthe jack. 7

Signed at 182234 Park Row Building,

New York city, N. Y., this 7th day of June,

JOHN M. CANTWELL.

